High Speed
Williams, 1986Hello I am working on a high speed and both left and right kickers are dead. I pulled the coils and the sleeves are melted inside both and when I do a switch test I get no response. Any ideas on what may have happened to cause this and where I should focus on to start my repair once I get the coils? Thanks
Sounds like a problem in the special solenoid section of the MPU board. I'd start by checking Q71 and Q75 and the pre driver transistors Q70 and Q74. If they all test out okay, then you're probably looking at the 7402 chip at U45.
To get the kickers to register in the switch test you have to pull the arms towards the centre of the playfield. The scoring switch is a separate switch from the one that activates the coil.
Post edited by Grauwulf : Added more info.
Ok here is what I know and what I have done.... The new coils do register in a switch test and do fire when I ground the transistors. The switches do not register any score when hit. I checked the white wire that piggybacks all of the switches and it looks good. Is there anything else I should look at that could be the problem before I go back into the board past the transistors?
Okay, you've verified that the coils are good and everything is okay back to the drive transistors. I'm not entirely sure what you mean by the coils showing up in the switch test. Do the slings fire when you close the switches that stick up through the playfield? If they do, then everything is working as it should. High Speed has separate scoring switches for the slingshots, and if you aren't getting any scoring, these could be your problem.
I'm pointing to the scoring switch in this picture, and they are switch 49 and 50 in the switch test. If neither one is registering, check the star rollovers at the top of the playfield, they are on the same column of the switch matrix.
If the kickers aren't scoring now, check and adjust your scoring switches. As for them not firing, check for continuity from the trigger switches back to the MPU board, connector 1J18 pin 3 and pin 5. If you have the game in test mode, you can ground pin 3 and pin 5 and see if the coils fire. If they do, then the problem lies with your switches.
http://www.greatplainselectronics.com/search.asp
I'm down in Rock Hill if you need more.
Quoted from jasonp:One of the kickers was scoring before I put in the new coils ... Weird
Read up on the operation special solenoids for early sys 11s. Scoring has nothing to do with the coils, so not weird but expected.
http://techniek.flipperwinkel.nl/wms11/index1.html
1f. Getting Started: The Circuit Boards and How they Work "The Six Special Solenoids"
One of the most common problems with early sys 11s is the coil activation switch getting stuck or jammed. I just fixed this problem on a friends game. A switch can be misadjusted, or bumped/bent when doing other nearby work.
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